Dichotic listening performance with cochlear-implant simulations of ear asymmetry is consistent with difficulty ignoring clearer speech.
Dichotic listening performance with cochlear-implant simulations of ear asymmetry is consistent with difficulty ignoring clearer speech.
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DOI：
10.3758/s13414-021-02244-x
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发表时间：
2021-07
期刊：
影响因子：
--
通讯作者：
DeRoy Milvae K
中科院分区：
文献类型：
--
作者：
Goupell MJ;Eisenberg D;DeRoy Milvae K
有越来越多的双侧和单侧耳聋人工耳蜗（CI）用户希望通过双耳获得声音来改善空间听力能力。然而，目前还不清楚当输入功能不对称时，语音是如何处理的，这可能会对空间听觉能力产生影响。因此，功能不对称的听力控制和参数操纵使用通道声码器作为CI模拟。在实验1中，听力正常（NH）的听众执行了两耳分听任务（即，选择性地注意一只耳朵，忽略另一只）。光谱分辨率在每只耳朵中独立变化（4、8、16通道和未处理对照）。随着目标耳分辨率的降低和目标耳分辨率的增加，性能下降。在实验2中，这些结果被复制使用一个分开的注意力任务（注意到两个耳朵，报告一个句子完成后）在NH和双边CI听众，虽然整体表现低于实验1。在实验3中，频率-位置失配模拟浅CI插入深度（0-、3-、6-mm移位和未处理的对照）。随着目标耳位移的增加和目标耳位移的减少，性能主要下降;但是，性能非单调性发生。最糟糕的表现发生在两耳之间的移位匹配时，这表明音高相似性增加了难度。结果表明，它是更难以出席的耳朵，是相对退化或失真，这可能会设置空间听觉限制CI用户试图出席目标在复杂的听觉场景。
There are an increasing number of bilateral and single-sided-deafness cochlear-implant (CI) users who hope to achieve improved spatial-hearing abilities through access to sound in both ears. It is, however, unclear how speech is processed when inputs are functionally asymmetrical, which may have an impact on spatial-hearing abilities. Therefore, functionally asymmetrical hearing was controlled and parametrically manipulated using a channel vocoder as a CI simulation. In experiment 1, normal-hearing (NH) listeners performed a dichotic listening task (i.e., selective attention to one ear, ignoring the other) using asymmetrical signal degradation. Spectral resolution varied independently in each ear (4, 8, 16 channels, and unprocessed control). Performance decreased with decreasing resolution in the target ear and increasing resolution in the interferer ear. In experiment 2, these results were replicated using a divided attention task (attend to both ears, report one after sentence completion) in both NH and bilateral CI listeners, although overall performance was lower than in experiment 1. In experiment 3, frequency-to-place mismatch simulated shallow CI insertion depths (0-, 3-, 6-mm shifts, and unprocessed control). Performance mostly decreased with increasing shift in the target ear and decreasing shift in the interferer ear; however, performance non-monotonicities occurred. The worst performance occurred when the shift matched across ears, suggesting that pitch similarity increases difficulty. The results show that it is more difficult to attend an ear that is relatively degraded or distorted, which may set spatial-hearing limitations for CI users when trying to attend to a target in complex auditory scenes.
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